Add nonuniform tile sizes, device distributions, and grid orders to even more testers (depends on #143)

[neil-lindquist]

This PR continues the work of #143 to add support for nonuniform tile sizes, device distributions, and grid orders to more testers. I also made a couple of related warning messages more consistent. However, I didn't change the defaults of run-tests.py to test the added configurations.

The change is largely realized by refactoring the matrix creation logic into a helper function. This helps reduce the amount of duplicate code, which actually reduces the line count and the executable size a little bit.

Other improvements

• Fixed a bug in henorm and synorm when tiles are nonuniform
• Removed test/scalapack_support_routines.hh since it's no longer used
• The meaning of the values of the dev-dist param was flipped to match slate/func.hh
• The norm testers were adjusted to be more consistent between them.

This PR ended up longer than intended. I'd probably suggest starting with test/test_util.hh, test/matrix_util.hh, and test/matrix_util.cc. Also, the norm testers have some big indent changes, so I'd suggest reviewing that diff with "ignore whitespace" enabled.

Diff w/ #143

[mgates3]

Since #143 is merged, can I drop the Draft label? Locally I rebased this to include the changes that I added to #143. I need to double-check that code before I push it.

[neil-lindquist]

Yes, the draft status was just waiting for #143.

[mgates3]

I rebased this on top of the current master with the merged-in #143. There were some merge conflicts, which hopefully I managed correctly. (I did them twice and compared to make sure.)